The photocatalytic degradation of betamethasone sodium phosphate was investigated in aqueoussuspensions of zinc oxide nanoparticular with diameter size 20 nm under a variety of conditions.Different parameters such as irradiation time, the amount catalyst (0.12-0.8 g LH), initialconcentration of drug (10-50 mgLjand initial pH values (ranging from 3 to II) were investigatedin the presence of vari...

the kinetics of the potassium thiocyanate transport mediated by dicyclohexyl-18-crown-6 (l) through a bulk liquid membrane is studied experimentally and theoretically. the proposed model is based on the assumption of a pure diffusion of the complex salt [k·l]+scn¯ through the liquid membrane stagnant films at the interfaces. it illustrates the connection between liquid-liquid extraction equilib...

Uptake of inorganic phosphate, an essential but often limiting nutrient, in bacteria is usually accomplished by the high-affinity ABC-transport system Pst. Pathogenic species of mycobacteria contain several copies of the genes encoding the Pst system (pstSCAB), and two of the encoded proteins, PstS1 and PstS2, have been shown to be virulence factors in Mycobacterium tuberculosis. The fast-growi...

Glucose is absorbed through the intestine by a transepithelial transport system initiated at the apical membrane by the cotransporter SGLT-1; intracellular glucose is then assumed to diffuse across the basolateral membrane through GLUT2. Here, we evaluated the impact of GLUT2 gene inactivation on this transepithelial transport process. We report that the kinetics of transepithelial glucose tran...

Active transport of exogenous sulfate into log phase cells of Porphyridium aerueineum followed Michaelis-Menten kinetics, and the apparent Km for sulfate transport is approximately 2.5 x 10(-6)m. Molybdate, also a group VI anion, is a competitive inhibitor of sulfate transport, and the inhibition is freely reversible. Once in the cell, molybdate depresses the rate of sulfate pool utilization by...

BACKGROUND Recent studies demonstrate that interstitial inorganic phosphate is significantly elevated in the breast cancer microenvironment as compared to normal tissue. In addition it has been shown that breast cancer cells express high levels of the NaPi-IIb carrier (SLC34A2), suggesting that this carrier may play a role in breast cancer progression. However, the biochemical behavior of inorg...

In a previous communication from this laboratory (1) a reaction of inorganic phosphate with water was described which occurred during phosphorylation coupled to oxidation in the electron transport system in liver mitochondria. This reaction was followed by observing the replacement of 018 in labeled inorganic phosphate by normal oxygen from water concomitant with the occurrence of phosphorylati...

Secondary active transport of substrate across the cell membrane is crucial to many cellular and physiological processes. The crystal structure of one member of the secondary active transporter family, the sn-glycerol-3-phosphate (G3P) transporter (GlpT) of the inner membrane of Escherichia coli, suggests a mechanism for substrate translocation across the membrane that involves a rocker-switch-...